Seong Gook Oh defeated Sang Oh Oh 6-4 6-2 in the Korea F5 qualifying round of 16 on hard. The upset overturned the form book — Sang Oh Oh came in leading the head-to-head 1–0. Seong Gook Oh claimed a first win over Sang Oh Oh in two meetings, levelling the head-to-head at 1–1.
Gook Oh S. took it in straight sets.
Seong Gook Oh beat Sang Oh Oh 6-4 6-2. Umpiry, "Seong Gook Oh vs Sang Oh Oh — Korea F5 Qualifying Round of 16", https://umpiry.com/match/2015-08-24/oh-vs-oh-korea-f5-q16?utm_source=cite (as of 24 August 2015).